<template>
  <el-upload
    :action="action"
    :data="data"
    :name="name"
    :before-upload="beforeUpload"
    :on-exceed="onExceed"
    :on-success="onSuccess"
    :file-list="files"
    :limit="max"
    drag
  >
    <div class="slot">
      <i class="el-icon-upload" />
      <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>
    </div>
    <div v-if="!notip" slot="tip" class="el-upload__tip">
      <div style="display: inline-block;">
        <el-alert :title="`上传文件支持 ${ ext.join(' / ') } 格式，单个文件大小不超过 ${ size }MB，且文件数量不超过 ${ max } 个`" type="info" show-icon :closable="false" />
      </div>
    </div>
  </el-upload>
</template>

<script>
export default {
  name: 'FileUpload',
  props: {
    action: {
      type: String,
      required: true
    },
    headers: {
      type: Object,
      default: () => {}
    },
    data: {
      type: Object,
      default: () => {}
    },
    name: {
      type: String,
      default: 'file'
    },
    size: {
      type: Number,
      default: 2
    },
    max: {
      type: Number,
      default: 3
    },
    files: {
      type: Array,
      default: () => []
    },
    notip: {
      type: Boolean,
      default: false
    },
    ext: {
      type: Array,
      default: () => ['zip', 'rar']
    }
  },
  methods: {
    beforeUpload(file) {
      const fileName = file.name.split('.')
      const fileExt = fileName[fileName.length - 1]
      const isTypeOk = this.ext.indexOf(fileExt) >= 0
      const isSizeOk = file.size / 1024 / 1024 < this.size
      if (!isTypeOk) {
        this.$message.error(`上传文件只支持 ${this.ext.join(' / ')} 格式！`)
      }
      if (!isSizeOk) {
        this.$message.error(`上传文件大小不能超过 ${this.size}MB！`)
      }
      return isTypeOk && isSizeOk
    },
    onExceed() {
      this.$message.warning('文件上传超过限制')
    },
    onSuccess(res, file) {
      this.$emit('on-success', res, file)
    }
  }
}
</script>

<style lang="scss" scoped>
::v-deep .el-upload-dragger {
    width: auto;
    height: auto;
    overflow: unset;
    &.is-dragover {
        border-width: 1px;
    }
}
.slot {
    width: 300px;
    height: 160px;
}
</style>
